A) 13 min. and 20 sec |
B) 20 min. and 13 sec |
C) 25 min. and 20 sec |
D) None of these |
A) 13 min. and 20 sec |
v = \( \Large \frac{10 km}{\frac{12}{60 hr}} \) = 50 kmph
New speed = 45 kmph, distance = 10 km
Therefore, t = \( \Large \frac{10}{45}hrs \)
= \( \Large \frac{10}{45} \times 60 min \)
= 13 min 20 sec.